Ba Ba Dum!

Memrise is a free tool for learning vocabulary in multiple languages, using enhanced flashcards, powerful memory techniques, spaced repetition, and community sharing. Flashcards, lists, and mnemonics that are added by anyone are available to all (for study and in a "Memorable Dictionary").

Mnemosyne (named for the Greek goddess of memory, Mnemosyne) is spaced repetition software developed from 2003 until the present. The software is similar to SuperMemo, commercial software developed by Piotr Wozniak.

Learning with Texts (LWT) is a tool for Language Learning, inspired by Stephen Krashen's principles in Second Language Acquisition, Steve Kaufmann's LingQ System and ideas from Khatzumoto (published at AJATT - All Japanese All The Time). 100 % free, Open Source, in the Public Domain.

Tinycards is a learning and memorization app from Duolingo . Learn almost anything with delightful, animated decks. Create your own decks and share them with friends, or pick from a variety of ready-made collections.

SuperMemo (from "Super Memory") is a learning method and software package developed by SuperMemo World in Poland from 1985 to the present. It is a practical application of the spaced repetition learning technique that has been proposed for efficient instruction by a number of psychologists as early as in the 1930s. The authors of the learning method, and lead programmers of the software, are Dr Edward Jacek Gorzelanczyk and Dr Piotr Wozniak.

WordListHub.com is a web application forlearning languages. You can use it to learn words by playing games.